More than 70 UK schools have improved their energy efficiency by installing this London-based company’s prefabricated buildings, which are quick to install and often feature solar panel roofs. The firm’s projects include Biddenham, a Bedford school that it claims is the UK’s largest zero carbon building. In 2015, private equity firm Cabot Square Capital took a majority stake in the business for an undisclosed sum. Sales hit £7.1m in 2016. Neil Gething, 55, and Neil Smith, 57, who started the business in 2010, previously set up Isis Telecommunications, which featured on Fast Track 100 in 2004.

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